Finding the Fourth Proportional to 1,367.72, 1,887.15 and 808.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,367.72 : 1,887.15 = 808.21 : x
2. Step 2: Convert to fraction form
   1,367.72/1,887.15 = 808.21/x
3. Step 3: Cross multiply
   1,367.72x = 1,887.15 × 808.21
4. Step 4: Simplify right side
   1,367.72x = 1,525,214.35
5. Step 5: Solve for x
   x = 1,525,214.35/1,367.72
6. Step 6: Final answer
   x = 1,115.15